Most played cards in Karn Echoes:

31 Decks
Ancient Tomb
124 copies - 4 average
Lotus Petal
114 copies - 3.68 average
Mox Opal
102 copies - 3.29 average
Urza's Saga
96 copies - 3.1 average
Lion's Eye Diamond
91 copies - 2.94 average
Echo of Eons
91 copies - 2.94 average
Karn, the Great Creator
86 copies - 2.77 average
Force of Will
68 copies - 2.19 average
Urza's Bauble
59 copies - 1.9 average
City of Traitors
58 copies - 1.87 average
Chalice of the Void
55 copies - 1.77 average
Seat of the Synod
55 copies - 1.77 average
Mishra's Bauble
53 copies - 1.71 average
Emry, Lurker of the Loch
52 copies - 1.68 average
Hullbreacher
39 copies - 1.26 average
Tormod's Crypt
37 copies - 1.19 average
Mystic Forge
35 copies - 1.13 average
Sai, Master Thopterist
34 copies - 1.1 average
Defense Grid
34 copies - 1.1 average
Grim Monolith
32 copies - 1.03 average